reusable products, recrgeable batteries is one example. a canvas tote bag is another example, something you can reuse again and again. >> i'm michael finney, "7 on your side." >> with growing concern about climate change, scientts have growing concerns about water supplies. will there be enough in rivers and dams to go around to our houses and to our farmers abc 7's wayne freedman reports. >> in a field filled with old hand planted grap in napa, there is an expement underway. it could chae agriculture as we know it. >> the theory is we have to make water from air without using engy and plt our plants with that. >> reporter: petersed to grew tulips in holland, but sees this as a greater calling. since 1994, he's been developing these wate boxes, as he calls them. they cooat night, pull moisture from the air, and use it to irrigate young plants and treeof all kinds. it's t same process you see here when cold liquid in the glass condses water from the outside air.